Research On Technology Of Space-Air Integrated Network And The Simulation Platform

Spacecraft and the satellite have developed rapidly in last two decades. This draws human’s attention to extend the network to the space. Because of the booming of IP network and its bottleneck of transmission and bandwidth, there causes a strong need to build the integrated network. Integrated network is set up by satellite network, which provides seamless coverage to earth, and ground networks, not only can relieve the transmission-pressure of the ground backbone networks, but also can afford the accessibility of some untouchable areas by its extensive cover area. The areas are hard to make optical fiber or base-station to reach. Moreover, the research of integrated network makes a difference in country’s military deployment for the importance of satellite and its information. Hence, research and development of integrated network are the trend of information globalization and the future spacing activity. Integrated network brings ground networks and satellite network together by building the link between ground node and satellite or spacecraft node. Because of the high-speed and periodically of satellite movement, the topology of satellite are foreseeable changeable. And this changeable topology leads a difference of system and protocol between IP networks. Besides, the critically asymmetry of satellite network’s traffic flow、the limit of satellite’s calculating and storage ability and the high delay of inter-satellite link are the emphasis during the research of integrated network.Under the background of hotspot and difficulty of the integrated network, this thesis does research of some key technology. The key technology of integrated network can be divided to two parts. The first one corresponds to integrated network’s three substructures—satellite network、ground network and the accessing of ground nodes. The second part is the main technology of integration, concluding traffic splitting and integrated survivability. This thesis is focus on the first part.As to the air network, we mainly discuss about the time slot assignment algorithm to tackle the allocation of channel resources. We propose a new algorithm for some small air network, which is named DSAA-AF(Dynamic Slot Assignment with Adaptive Frame). DSAA-AF adjusts the number of time slot in a frame to accommodate the network traffic. According to the simulation result, we find that DSAA-AF has an advantage in delay and packet loss ratio.As to the satellite network, the IP-lization is the trend. New routing algorithm is the main object in this thesis. Based on the feature of satellite network, we solve the problem of traffic engineering and satellite survivability by IP MTR(Multi-topology Routing). We propose two algorithms in a snapshot—SMTR-OD and SMTR-LB. Moreover, in order to save the routing overhead, we propose SMTR-SS between the snapshots. We built simulations to study the delay and link load. Considering the project requirements, we build the space-air network simulation platform in OPNET at the last part of this thesis.